Extraordinary design - offset umbrellas
Umbrellas with a mast sidewise of the cover. They have the advantage that there is no annoying stick in the middle - unobstructed mobility under the sunshade.
There exist many different terms for these umbrellas, so Zangenberg calls it "offset umbrella" while glatz uses the name "free arm umbrella".
Glatz company is seen as the inventor of this model which has become popular especially in recent years. There are different modes of operation, so it is both possible to bend it and to rotate it.
Generally umbrellas with a mast in the middle can be considered as more robust because of their construction.